Castle Dome Landing's post office was established
December 17, 1875 and discontinued June 16, 1884. Castle Dome
Landing was the supply and shipping depot for mines in the nearby
Castle Dome Mountains. It was the first stop for steamboats on
their way up the Colorado river. A small but active town, Castle
Dome Landing had a store, hotel, saloon, stage agency, smelting
furnace, and a justice of the peace. As the mines played out
there was no longer a need for a supply town. Today the site
is covered by water after the building of the Imperial Dam.